<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>欢迎注册</title>
  <link href="../css/register.css" rel="stylesheet">
</head>
<body>
<div class="form-div">
  <div class="reg-content">
    <h1>欢迎注册</h1>
    <span>已有帐号？</span> <a href="#">登录</a>
  </div>
  <form id="reg-form" action="#" method="get">
    <table>
      <tr>
        <td>用户名</td>
        <td class="inputs">
          <input name="username" type="text" id="username">
          <br>
          <span id="username_err" class="err_msg" style="display: none">用户名不太受欢迎</span>
        </td>

      </tr>
      <tr>
        <td>密码</td>
        <td class="inputs">
          <input name="password" type="password" id="password">
          <br>
          <span id="password_err" class="err_msg" style="display: none">密码格式有误</span>
        </td>
      </tr>
      <tr>
        <td>手机号</td>
        <td class="inputs"><input name="tel" type="text" id="tel">
          <br>
          <span id="tel_err" class="err_msg" style="display: none">手机号格式有误</span>
        </td>
      </tr>
    </table>
    <div class="buttons">
      <input value="注 册" type="submit" id="reg_btn">
    </div>
    <br class="clear">
  </form>
</div>


<script>

  //1. 验证用户名是否符合规则
  //1.1 获取用户名的输入框
  var usernameInput = document.getElementById("username");

  //1.2 绑定onblur事件 失去焦点
  usernameInput.onblur = checkUsername;

  function checkUsername() {
    //1.3 获取用户输入的用户名
    var username = usernameInput.value.trim();

    //1.4 判断用户名是否符合规则：长度 6~12,单词字符组成
    var reg = /^\w{6,12}$/;
    var flag = reg.test(username);

    //var flag = username.length >= 6 && username.length <= 12;
    if (flag) {
      //符合规则
      document.getElementById("username_err").style.display = 'none';
    } else {
      //不合符规则
      document.getElementById("username_err").style.display = '';
    }

    return flag;
  }


  //1. 验证密码是否符合规则
  //1.1 获取密码的输入框
  var passwordInput = document.getElementById("password");

  //1.2 绑定onblur事件 失去焦点
  passwordInput.onblur = checkPassword;

  function checkPassword() {
    //1.3 获取用户输入的密码
    var password = passwordInput.value.trim();

    //1.4 判断密码是否符合规则：长度 6~12
    var reg = /^\w{6,12}$/;
    var flag = reg.test(password);

    //var flag = password.length >= 6 && password.length <= 12;
    if (flag) {
      //符合规则
      document.getElementById("password_err").style.display = 'none';
    } else {
      //不合符规则
      document.getElementById("password_err").style.display = '';
    }

    return flag;
  }


  //1. 验证手机号是否符合规则
  //1.1 获取手机号的输入框
  var telInput = document.getElementById("tel");

  //1.2 绑定onblur事件 失去焦点
  telInput.onblur = checkTel;

  function checkTel() {
    //1.3 获取用户输入的手机号
    var tel = telInput.value.trim();

    //1.4 判断手机号是否符合规则：长度 11，数字组成，第一位是1

    //var flag = tel.length == 11;
    var reg = /^[1]\d{10}$/;
    var flag = reg.test(tel);
    if (flag) {
      //符合规则
      document.getElementById("tel_err").style.display = 'none';
    } else {
      //不合符规则
      document.getElementById("tel_err").style.display = '';
    }

    return flag;
  }


  //1. 获取表单对象
  var regForm = document.getElementById("reg-form");

  //2. 绑定onsubmit 事件
  regForm.onsubmit = function () {
    //挨个判断每一个表单项是否都符合要求，如果有一个不合符，则返回false

    var flag = checkUsername() && checkPassword() && checkTel();

    return flag;
  }

</script>
</body>
</html>